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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Effective Income Tax Rate Reconciliation | The difference between income taxes expected at the U.S. federal statutory income tax rate of 21% and the reported income tax expense (benefit) are summarized as follows:
| Year Ended December 31,
2021 |  | 2020
Income tax (benefit) at statutory rate | $ | (11,330) |  |  | $ | (4,661) |
Valuation allowance | 11,500 |  |  | 4,408 |
State income tax (benefit), net of federal benefit | (1,978) |  |  | (330) |
Business tax credit net of reserves | (190) |  |  | — |
Non-deductible expenses | 2,210 |  |  | 585 |
Business combination | (437) |  |  | — |
Foreign income taxes at different rate | (201) |  |  | — |
Income tax (benefit) expense | $ | (426) |  |  | $ | 2 |
Effective tax rate | 0.79 | % |  | (0.01) | %
Provision Expense for Income Taxes | The provision expense for income taxes consists of the following:
| Year Ended December 31,
| 2021 |  | 2020
Current: |  |  |
Federal | $ | — |  |  | $ | — |
State | 11 |  |  | 2 |
Foreign | — |  |  | — |
Total current | 11 |  |  | 2 |
Deferred: |  |  |
Federal | (416) |  |  | — |
State | (21) |  |  | — |
Foreign | — |  |  | — |
Total deferred | (437) |  |  | — |
Total income tax (benefit) expense | $ | (426) |  |  | $ | 2 |
Components of Net Deferred Income Taxes | The components of net deferred income taxes consist of the following:
| December 31,
| 2021 |  | 2020
Deferred tax assets: |  |  |
Net operating loss | $ | 40,922 |  |  | $ | 30,705 |
Unrealized loss on digital assets | 2,015 |  |  | — |
Tax credits | 1,416 |  |  | 1,193 |
Reserves and accruals | 732 |  |  | 3,739 |
Leases - lease liability | 376 |  |  | — |
Amortization of acquired intangibles | 232 |  |  | — |
Other deferred tax assets | 1,748 |  |  | — |
Gross deferred tax assets | 47,441 |  |  | 35,637 |
Less valuation allowance | (46,163) |  |  | (35,100) |
Total deferred tax assets | 1,278 |  |  | 537 |
Deferred tax liabilities: |  |  |
Amortization of acquired intangibles | — |  |  | (537) |
Leases - right of use asset | (306) |  |  | — |
Other deferred tax liabilities | (972) |  |  | — |
Total deferred tax liabilities | (1,278) |  |  | (537) |
Net deferred tax liabilities | $ | — |  |  | $ | — |
Reconciliation of Unrecognized Tax Benefits | The following is a tabular reconciliation of the total amounts of unrecognized tax benefits:
| December 31,
| 2021 |  | 2020
Unrecognized tax benefits, beginning of period | $ | 1,314 |  |  | $ | 1,531 |
Tax positions taken in prior periods: |  |  |
Gross increases | — |  |  | 69 |
Gross decreases | — |  |  | (297) |
Tax positions taken in current period: |  |  |
Gross increases | 231 |  |  | 11 |
Settlements | — |  |  | — |
Lapse of statute of limitations | — |  |  | — |
Unrecognized tax benefits, end of period | $ | 1,545 |  |  | $ | 1,314 |

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